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Person.java
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60 lines (48 loc) · 1.69 KB
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// demonstrates static/non-static fields and methods
// simulates a person (not in the Blade Runner sense)
public class Person {
// instance variable: age of this person
private int age;
// another instance variable: name of this person
private String name;
// static variable (shared by all instances): global population
private static int population = 0;
// constructor
public Person(int a, String n) {
// copy arguments of constructor to instance variables
age = a;
name = n;
// increase the static counter
population++;
}
// static method (not per-instance)
public static void printPop() {
System.out.println(population);
}
// instance method
public void printName() {
System.out.println(name);
}
// another instance method
public void printInfo() {
System.out.println(age);
// calling an instance method without a period
// (uses same instance as what printInfo was called on)
printName();
}
public static void main(String[] args) {
// calling a static method using class name and period
// what is the output?
Person.printPop();
// how many instances does this construct?
Person myDad = new Person(33, "Lucius");
Person myMom = new Person(44, "Pandora");
Person myDentist = myMom;
// calling an instance method using instance name and period
myDentist.printInfo();
// calling a static method without a period
// (uses Person, the containing class, by default)
// what is the output?
printPop();
}
}